The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 2003
Filed:
Jun. 16, 1999
Kenji Kataoka, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
There is provided a method of authenticating a portable data-communication terminal user in a system comprising a portable data-communication terminal and a device for authenticating a user both including a transceiver for making radio-communication to each other, the method including the steps of (a) transmitting and receiving user-authentication data between the portable data-communication terminal and the user-authenticating device to thereby carry out check as to whether the portable data-communication terminal is far away from the user-authenticating device by a distance equal to or smaller than a first distance within which the transceiver can make radio-communication between the portable data-communication terminal and the user-authenticating device, and (b) allowing the portable data-communication terminal to carry out a predetermined operation only when the portable data-communication terminal is authenticated to be located within the first distance from the user-authenticating device. In accordance with the method, only when an authorized user having both the portable data-communication terminal and the user-authenticating device uses the portable data-communication terminal, the portable data-communication terminal is allowed to carry out a certain operation. Hence, it is possible to prevent a third party from using the portable data-communication terminal without permission of the user.